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High-security mechanical locks : an encyclopedic reference by Graham Pulford

By Graham Pulford

High-Security Mechanical Locks comprehensively surveys and explains the hugely technical quarter of excessive protection locks in a manner that's available to a large viewers. good over a hundred diverse locks are offered, prepared into 6 simple forms. each one bankruptcy introduces the mandatory options in a historic viewpoint and extra categorizes the locks. this can be by way of certain 'how it really works' descriptions with many photographs, diagrams and references. The descriptions are in keeping with real dissections of the true locks.

The scope is proscribed to key operated mechanical locks, therefore keyless mix locks and electronic locks aren't coated. The ebook doesn't care for regimen locksmithing subject matters akin to install and servicing of locks. The delicate quarter of picking out and bypassing of locks is handled in simple terms at a excessive point with no giving designated details that may be unacceptable within the fallacious hands.

* finished insurance of over a hundred types of nineteenth and twentieth century key-operated locks, unified in an easy category scheme
* exact working ideas - transparent 'how it really works' descriptions
* Manipulation resistance score for every lock on a scale of one to five

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Extra info for High-security mechanical locks : an encyclopedic reference

Sample text

This value of MACS is typical for 5-pin locks produced by Lockwood and Schlage. Further details on MACS are contained in [102]. The MACS has a significant effect on the number of available system permutations. For instance in a 5-pin system with a MACS of 7, the bitting code (2 7 1 9 3) would be ruled out since placing a depth 9 cut next to a depth 1 cut violates the MACS constraint. The computation of the number of permutations that satisfy the MACS is, in general, difficult. Nevertheless, for locks with six pins or fewer, one can write a computer program that simply generates all the theoretical permutations and excludes those that do not satisfy the MACS.

There is also a discussion on the grading of manipulation resistance as it has been interpreted in this book. Finally, the organization of the sections is presented. Scope Current locks can loosely be classed as electronic or mechanical, although quite a few use both principles. It would be ambitious to attempt to cover both electronic and mechanical locks in a single book, and the skills required to describe and understand both types are quite different. This book is restricted to mechanical locks, and in particular to key-operated mechanical locks.

3: Key for lock description headings. 4: Country naming conventions. 24 CHAPTER 1 INTRODUCTION In many cases the distinction in terminology is unimportant since there is no possible ambiguity. ” Other examples of words that have been used interchangeably include bitting, cut; section, profile, broaching; and change, code, differ, permutation, combination. When speaking of key or keying permutations, we have used the word “code” to mean the actual key bittings corresponding to the permutation. The reader should be aware that these are equivalent for so-called direct codes but not for indirect or blind codes.

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